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Tube Tinker — Electron Tube Database
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Specialized - Cathode Ray ·CathodeRay

22GP2

P2 radar cathode-ray display tube with electrostatic focusing and magnetic deflection, yellow-green fluorescence with green persistence, approximately 70-degree deflection, and typical 18 kV accelerator operation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B12A
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

Twenty-two-inch flat-face radar CRT with electrostatic focus, magnetic deflection, metal envelope, and aluminized screen.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B12A
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Radar CRT electron-gun/display section.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1960 Du Mont

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • Focusing Method

    Electrostatic text

  • Deflection Method

    Magnetic text

  • Phosphor

    P2 text

  • Fluorescence

    Yellow-green/green text

  • Persistence

    Long text

  • Deflection Angle

    70 deg

    Approximate

  • Screen Construction

    Aluminized/metal-backed text

Data set 02

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • Focusing Method

    Electrostatic text

  • Deflection Method

    Magnetic text

  • Deflection Angle

    70 deg

    Approximate

  • Cathode-to-All Capacitance

    5 pF

    Approximate

  • Grid1-to-All Capacitance

    6 pF

    Approximate

  • Phosphor Number

    2 text

  • Fluorescence

    Yellow-Green text

  • Phosphorescence

    Green text

  • Persistence

    Medium text

Other

  • Maximum Accelerator Voltage

    24000 V

  • Maximum Grid2 Voltage

    800 V

  • Maximum Grid1 Negative Bias

    125 V

  • Maximum Grid1 Positive Peak Voltage

    2 V

  • Typical Accelerator Voltage

    18000 V

    RadarDisplay

  • Typical Grid2 Voltage

    400 V

    RadarDisplay

  • Grid1 Voltage Minimum

    -70 V

    RadarDisplay

  • Grid1 Voltage Maximum

    -45 V

    RadarDisplay

  • Focus Voltage Minimum

    0 V

    RadarDisplay

  • Focus Voltage Maximum

    400 V

    RadarDisplay

  • Modulation Voltage Maximum

    35 V

    100FootLamberts

  • Maximum Grid1 Circuit Resistance

    1.5 Mohm